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Mirrors > Home > MPE Home > Th. List > nn0ex | Structured version Visualization version Unicode version |
Description: The set of nonnegative integers exists. (Contributed by NM, 18-Jul-2004.) |
Ref | Expression |
---|---|
nn0ex |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-n0 11293 |
. 2
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2 | nnex 11026 |
. . 3
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3 | snex 4908 |
. . 3
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4 | 2, 3 | unex 6956 |
. 2
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5 | 1, 4 | eqeltri 2697 |
1
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